Having gnawed at the walls of his previous bedroom, he has received a special gift of an inedible bedroom on his sixth birthday.
His mother Rachel noticed that her son's craving for inedible objects went to a special level when he began to chew blinds and plasterboard. 'We don't know what appeals to him about the objects around him but there's nothing we can do to stop him trying to chew through anything and everything,' she said.
Zach's new bedroom adopts a special design with squash-court walls that has a tough surface. This would make it difficult for him to gnaw at them.
Ms Horn said: 'His wardrobes and chest of drawers have been made with rounded edges and installed so he can't pull them over'.
The bedroom has cost the family quite a huge amount - Ģ36,000.